26 Jul
2013
26 Jul
'13
10:38 p.m.
On 27/07/2013, at 2:32 AM, Eric Smith <spacewar at gmail.com> wrote:
The black blob problem, which usually eventually
reaches the all-black
case, is caused by a chemical change (oxidation?) of the liquid
crystal material, and I don't think there's anything you can do
electrically that's going to fix or even reduce the problem. AFAICT
that's caused by the seal failing, which can be caused by temperature
extremes, but sometimes just happens as a result of aging.
I wonder if it is possible to reseal or place an extra seal on existing old (but still
good) displays to preserve them a bit longer.
From my relatively small sample it seems that age alone
does't have much bearing, as out of eight Powerbooks the two older PB100 are not
affected (but they do have other problems).